Rotary electric transformer and motor-generator.



J. G. MACFARLANE & H. BURGE. ROTARY ELECTRIC TRANSFORMER AND MOTQB GENERATOR. APPLICATION FILED FEB. '7, 1910.

1,024,410 Patented Apr. 23, 1912.

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wigs miiim'fliibUN MAoFARLAnE AND HARRY Bones. on We? esnits .F-NG'LANIJ, ASSIGNORS TO THE FIRM orcnonnron AND ew: L11. ARC wanes, CHELMSFORD, ENGLAND.

'IRCTARY ELECTRIC TRANSFORMER AND MQTCPE-GENERATQM l-aiif flii'lfi. Specification of Letters Patent. Fatwa wad. Apr. Application filed February 7, 1910. Serial No Eh when it may col Loam: sometimes as 1110201" and s i. ii; known that We, JAMES COLQUI-IOUN generalor, depending upon cone and HARRY BURon, subjects of will be hereafter explained.

" an: Gieat Britain, residing at Are The four pole eon 5 .iic msford, in the county of Essex nets ll E. oi the portion 1;. lino? J i e invented Certain new and nets N 51 or? the portion. l3; VBPJGHiTS in. Rotary Electric N, S, are provided Wiii'h a. a

re and Elmer-Generators, of HQCilNl aeross the snpily i a e :lo'lowing' is a specification. serving as e constant s fl'tled 10 iiion relates to a dynamo else the half A of the tlil line of the kind which has a single nets N S are provioesl *Rfi e, the said armature being (lialso connected sci-05s he olioi part zincl'a genemtor purl: but in series will: rev of m'lxiliary brushes such as are. said Wimling" l? seiving ii: is referred to, along a plane which "El'SlblEl separate exeiliiliion '1. '3 .e

masses illii lgil the said brushes, and a field of the miniature, .iperntng es miein s divided into a motor part and explained. Theqecond paiiof brushes 13 1* part, eacli part being provided are called. lhe main brushes one oenrlent windings. In additionlo' these, say the brush l is eenneoaell diiecilly- My brushes the machine is prolo the negalive pole L of the s pniy main a pair of ordinary brushes called the brush G being connected. to iiie ores in brushes. of a males to be driven C Wi'iereef lihe o The present invention consists in adapting brush K is eonneclecl lo'the negative on such whine to the control of electric moply main L. it. will thus be seen l'ha'" 25 or en the welllinown Yard-Leonard motor to be driven G is connected eei'oss n'inciple, and. in the application of such a supply niains J, L through the half ii of 8%? n'mehine to electrical regenerative control the motor generate? and may reee E. M. F. of anything from no volizzs of the supply 21mins J, L, or en i the 39 zinylhiiw' *l'i'oni that; of llie supply ins J, L. 2p lo liwiee than; of lhe supply vol? 8; ly connected to the negative or other depending; upon l'he excilalion of l y in in. The second main brush is M of ilielmli l; oi the nrnnilni-e, n'hi sled in one terminal of the driven 1m be myiee'l :is is well known in .6 whose speed to be controlled, lheother sign by means of he revel v iei'mizml of which is connected directly to controlling such excii'nfiion. Fe he 3. live supply main. i'he half ll of the :Elll'llilllfi may he 5 The invenliion is illnsl'i'al'ed (lizigi'nming an ii. iii. l4. equal we oppw 11E lhe accompanying drawing. l). M. l of ihe sup; 1y anal the mo 13 (flii'iiiil m'zneiui'e divided into under those circumstances receive is A. B, respectively, is mlapted F. mill will therefore EQllliilii s ron ie in ll foul-pole field. Said ni'nml? en l'iie other llililli {he shunt s 'iiii'y'lilfli with four brushes, two of llH half B is completely 1 z i. i), are placed in the neuli'nl posibrought up (0 ilie full slien 'ih in the oppin ihe second pair F, G, in the onlisilo direction. that in my the same sense esilioi' Said brushes I), E, are 0011- as lvhe l. M. F. of the Suppl; I llien eleel'i'icnlly and are milled to:- (3 will receive not only {he i'uil.

shore pirenileel auxiliary brushes and of the line but ll Mm equal to ln'i'm us,

C(jllllllCiOi' joining Stllil auxiliary brushes due to the inerti'hel' me mo xn: 'eloi is m} ll, E is eoniieeiml i o one pole of the supply helping the line lo lne will :is mm 'ns, say line positive pole J. voltage, and said motor Q i fore rim.

F le pair of Sl'lUl'f-ljll'fillltGLl auxiliary L l full speed. i i lien Ellis co in i), la, ill'v'lfi'ifithe a'rmeture into the the dish-million 031 the on; 5 i twe nortions A, B, each of which may serve poles N S becomes a" L lion ol 1;

reversal in the direction of the shunt current, and the machine consequently becomes a four-pole machine in the ordinary sense, and remains so as long as the voltage of the secondary circuit is double that of the primary circuit.

When the motor C is running under load and the volts across the motor C are less than the supply voltage, the part B of the motor generator Works as a motor, and the part A Works as a generator and when the volts across the motor C are greater than the supply volts the part B of the motor generator works as a generator, and the part A as a motor. The converse obtains when the apparatus is regenerating, that is to say when the motor C is returning current to the line, for in this case when the volts across the motor C are less than the supply voltage the part B works as a generator and the part A as a motor and when the volts across the motor 0 are greater than the supply volts the part B works as a motor, and the part A as a generator. 1

What we claim is An electric motor control system comprising supply ma-ins, a direct current ring armature adapted to rotate within four polar limbs, a pair of main brushes to said armature, a pair of short-circuited auxiliary brushes arranged at right angles to said main brushes and connected to one of said supply mains and dividing said armature into two portions, a constant separate excitation to one portion of said armature, a variable reversible separate excitation to the second portion of said armature serving to change the direction of the flow of the current through two ofesaid polar limbs when the secondary voltage is raised above the voltage of the mains, a direct current motor, brushes to said direct current motor, one of said motor brushes being connected to the other of said-"supply mains and to one of said main brushes, and the other of said motor brushes being connected to the other of said mainvbrushes.

In testimony whereof we have hereunto set our hands in presence of two subscribing Witnesses.

JAS. COLQUHOUN MACFARLANE. HARRY BURGE. Witnesses:

ERNEST J OHN HILL, HARRY J. STOGDEN. 

